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# a high school student volunteers to present a report to the administration about the types of lunches students prefer. he surveys members of his class and records their choices. what type of sampling did the student use? systematic random sampling voluntary sampling convenience sampling stratified sampling

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### James

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Sampling methods

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## What are sampling methods?

In a statistical study, sampling methods refer to how we select members from the population to be in the study.

If a sample isn't randomly selected, it will probably be biased in some way and the data may not be representative of the population.

There are many ways to select a sample—some good and some bad.

Convenience sample: The researcher chooses a sample that is readily available in some non-random way.

Example—A researcher polls people as they walk by on the street.

Why it's probably biased: The location and time of day and other factors may produce a biased sample of people.

Voluntary response sample: The researcher puts out a request for members of a population to join the sample, and people decide whether or not to be in the sample.

Example—A TV show host asks his viewers to visit his website and respond to an online poll.

Why it's probably biased: People who take the time to respond tend to have similarly strong opinions compared to the rest of the population.

PRACTICE PROBLEM 1

A restaurant leaves comment cards on all of its tables and encourages customers to participate in a brief survey to learn about their overall experience.

What type of sampling is this?

### Good ways to sample

Simple random sample: Every member and set of members has an equal chance of being included in the sample. Technology, random number generators, or some other sort of chance process is needed to get a simple random sample.

Example—A teachers puts students' names in a hat and chooses without looking to get a sample of students.

Why it's good: Random samples are usually fairly representative since they don't favor certain members.

Stratified random sample: The population is first split into groups. The overall sample consists of some members from every group. The members from each group are chosen randomly.

Example—A student council surveys

100 100 100

students by getting random samples of

25 25 25 freshmen, 25 25 25 sophomores, 25 25 25 juniors, and 25 25 25 seniors.

Why it's good: A stratified sample guarantees that members from each group will be represented in the sample, so this sampling method is good when we want some members from every group.

Cluster random sample: The population is first split into groups. The overall sample consists of every member from some of the groups. The groups are selected at random.

Example—An airline company wants to survey its customers one day, so they randomly select

5 5 5

flights that day and survey every passenger on those flights.

Why it's good: A cluster sample gets every member from some of the groups, so it's good when each group reflects the population as a whole.

Systematic random sample: Members of the population are put in some order. A starting point is selected at random, and every

n^{\text{th}} n th

n, start superscript, start text, t, h, end text, end superscript

member is selected to be in the sample.

Example—A principal takes an alphabetized list of student names and picks a random starting point. Every

20^{\text{th}} 20 th

20, start superscript, start text, t, h, end text, end superscript

student is selected to take a survey.

PRACTICE PROBLEM 1

Each student at a school has a student identification number. Counselors have a computer generate

50 50 50

random identification numbers and those students are asked to take a survey.

What type of sampling is this?

## Sampling methods

Picking fairly

Practice: Using probability to make fair decisions

Techniques for generating a simple random sample

Practice: Simple random samples

Techniques for random sampling and avoiding bias

Practice: Sampling methods

Sampling methods review

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Samples and surveys Next lesson

Types of studies (experimental vs. observational)

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## Want to join the conversation?

Posted 5 years ago. Direct link to angel's post “hey, i was wondering, wha...”

hey, i was wondering, what type of sampling method does this sentence use? "a biologist surveys all students from each of 15 randomly selected classes."

• Dagny 5 years ago

Posted 5 years ago. Direct link to Dagny's post “I'm pretty sure it's a cl...”

I'm pretty sure it's a cluster. Because it's all the students from the randomly selected classes, not x people from each class.

nguyentram9613 5 years ago

Posted 5 years ago. Direct link to nguyentram9613's post “I have to design a study ...”

I have to design a study and I devide population into 3 age groups. I randomly ask people to answer the survey but only one of three groups are my target and I only take the data of the targeted group. So which sampling method is this case belong to?

## Introduction to Statistics: Topic Test Flashcards

Start studying Introduction to Statistics: Topic Test. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

## Introduction to Statistics: Topic Test

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A high school student volunteers to present a report to the administration about the types of lunches students prefer. He surveys members of his class and records their choices. What type of sampling did the student use?🔹

Click card to see definition 👆

*convenience sampling

Click again to see term 👆

You want to survey people about their favorite exercise.

Click card to see definition 👆

You ask people on their lunch hour at a downtown intersection to name their favorite exercise.

Click again to see term 👆

1/25 Created by anonymusE2020hero

### Terms in this set (25)

A high school student volunteers to present a report to the administration about the types of lunches students prefer. He surveys members of his class and records their choices. What type of sampling did the student use?🔹

*convenience sampling

You want to survey people about their favorite exercise.

You ask people on their lunch hour at a downtown intersection to name their favorite exercise.

Which survey question is unbiased?

"Should there be a school dress code?"

To conduct a survey about the type of phone service most people in Greenville prefer, 10 different blocks in the neighborhood are chosen. On these 10 blocks, 10 houses are selected at random, and then one resident of each of those houses is interviewed. This type of sampling method is

*stratified sampling.

A set B consists of all natural numbers (counting numbers) less than or equal to 100. Use set-builder notation to define B.

B = {b|b ∈ N ≤ 100}

A geologist visits 10 randomly selected lakes in the region and collects soil samples in randomly selected areas along each shoreline.

stratified

What percentage of the students surveyed spend more than 1 hour per day on both video games and studying?

*19.1%

In a county survey, families with 3 or more children are chosen.

systematic

Which Venn diagram has shading that represents the intersection of set T and set V?

(picture of only the intersection of T and V shaded)

You want to know which football team is considered to be the best.

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32 terms kenziehobbs

### P&S: Designing a Study

15 terms anonymusE2020hero

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13 terms Brittany_Ann50

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19 terms anonymusE2020hero

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### Verified questions

PROBABILITY

If an honest coin is tossed N times, what is the probability of getting the same number of heads as tails?

Verified answer PROBABILITY Suppose that an \overline{X} X

control chart with two-sigma limits is used to control a process. Find the probability that a false out-of-control signal will be produced on the next sample. Compare this with the corresponding probability for the chart with three-sigma limits and discuss. Comment on when you would prefer to use two-sigma limits instead of three-sigma limits.

Find the margin of error for

\mu μ .

c = 0.95, s = 1.1, n = 25, \overline { x } = 3.5

c=0.95,s=1.1,n=25, x =3.5 Verified answer STATISTICS

Construct the described data set. The entries in the data set cannot all be the same. Median and mode are the same.

### NRRT 442 Test 2

30 terms dylan_seavey

### Permit test 2

55 terms carmelbooo

### Part 4 Review

32 terms jae_kneiko

### 1-17

17 terms kilxz963

### Related questions

QUESTION

In which situation would it be necessary to use a within-groups ANOVA?

What affects the width of a CI?

Chi-Square- What is it for? What kinds of data?

"The Most Misleading Graph Ever Published," discussed in your text, indicates that Cornell University's quality of education declined in recent years. In what way is this misleading?

Source : quizlet.com

## Sampling Methods.

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QUIZ

## Sampling Methods.

Sampling Methods. 67%

15.9K 6th - 12th 6th - 12th Mathematics David Behrendsen 3 years

## 14 Qs

1. Multiple-choice 1 minute Q.

Interview every 10th student who enters the school in the morning.

answer choices simple random voluntary response systematic convenience 2. Multiple-choice 1 minute Q.

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.

simple random sample

convenience

Self - selected (volunteer)

3. Multiple-choice 1 minute Q.

Political webpages often allow readers to rate (if they want to) whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:

Convenience Sampling

Simple Random Sampling

Systematic Random Sampling

4. Multiple-choice 1 minute Q.

Marianne wanted to know students' opinion on the new schedule at school. She survey's the first 30 students who come into her class.

Convenience Sampling

Systematic Random Sampling

Simple Random Sampling

Volunteer response 5. Multiple-choice 1 minute

Q. Disneyland often surveys its guests as they exit a restaurant during their visit. The surveyor stands at the restaurant exit, counts the number of people leaving, and surveys every 25th guest.

This is a form of: answer choices

Simple Random Sample

Stratified Random Sample

Voluntary Response

Systematic Random Sampling

6. Multiple-choice 1 minute Q.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the first five who raise their hands.

answer choices Systematic Convenience Self Selected Simple Random 7. Multiple-choice 1 minute Q.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the five closest to her desk.

answer choices simple random Self Selected. Convenience Systematic Random 8. Multiple-choice 1 minute Q.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She picks the student in every 5th seat.

answer choices Simple Random Systematic voluntary response convenience 9. Multiple-choice 2 minutes Q.

An independent research company wants to go door to door to survey people in the city of Fontana. The company decides to number all blocks within the city limit, randomly choose 1 block and survey all households on that block.

This is an example of:

Simple Random Sample

Stratified Random Sample

Cluster Random Sample

Systematic Random Sampling

10. Multiple-choice 1 minute Q.

A teacher hands out an index card and asks ALL of her students to write down the following information: age, height (in inches), and what grade they are in.

Which of the following best describes her method of data collection?

Simple Random Sample

Cluster Random Sample

Stratified Random Sample

11. Multiple-choice 1 minute

Q. A ___ is a large group that includes everything being studied.

Stratified Sampling Method

Population Voluntary-Response 12. Multiple-choice 1 minute

Q. A ___ is a small portion of the population used to gather data from.

Systematic Sampling Method

Sample Population Bias 13. Multiple-choice 1 minute Q.

A teacher wants to know how well her students are doing on a topic. She randomly picks one class to survey.

answer choices Simple Random Cluster Stratified Systematic 14. Multiple-choice 1 minute Q.

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

answer choices Stratified. Systematic Cluster Biased.

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James 14 day ago

Guys, does anyone know the answer?